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fix warning about unused variable
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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@ -205,7 +205,6 @@ namespace datalog {
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for (unsigned i = 0; i < rules.size(); ++i) {
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app* head = rules[i]->get_head();
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expr_ref_vector conj(m);
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unsigned n = head->get_num_args()-1;
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for (unsigned j = 0; j < head->get_num_args(); ++j) {
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expr* arg = head->get_arg(j);
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if (!is_var(arg)) {
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